VAMP 59 - Page 60

2.7 Directional earth fault
protection I0φ> (67N)
2 Protection functions
Technical description
60
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VM59.EN001
Figure 2.7-3. Two example of operation characteristics of the directional
earth fault stages in sector mode. The drawn I0 phasor in both figures is
inside the trip area. The angle offset and half sector size are user‟s
parameters.
Parameters of the directional earth fault stages
I
0
>, I
0
>> (67N)
Parameter
Value
Unit
Description
Note
Status
-
Blocked
Start
Trip
Current status of the stage
F
F
TripTime
s
Estimated time to trip
SCntr
Cumulative start counter
Clr
TCntr
Cumulative trip counter
Clr
SetGrp
1 or 2
Active setting group
Set
SGrpDI
-
DIx
VIx
LEDx
VOx
Fx
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Function key
Set
Force
Off
On
Force flag for status forcing
for test purposes. This is a
common flag for all stages and
output relays, too.
Automatically reset by a 5-
minute timeout.
Set
Io
IoCalc
IoPeak
pu
The supervised value
according the parameter
"Input" below.
(I
0
> only)